JavaScript、变量、警报、提示

Question

这些javascript代码是一样的吗？

//Code Sample 1
var first = prompt("What is the first number?");
var second = prompt("what is the second number?");
var sum = Number(first) + Number(second);
alert(sum);
//Code Sample 2
var firstNumber = prompt("Please provide the first number");
var secondNumber = prompt("Please provide the second number");
alert(Number(firstNumber) + Number(secondNumber));

Answer 1

行为是相同的。表达式Number(firstNumber) + Number(secondNumber)的求值可以在传递给alert函数之前存储在变量中，但它产生的结果与传递之前直接求值的结果相同